DeskClock: Add support of power off alarm feature

1. Add set and cancel power off alarm actions

Power off alarm feature is based on DeskClock app. Add set and cancel
power off alarm actions for the feature.

2. update alarm if it is handled in min framework

Update the alarm instance status when the power off alarm is handled
in min framework mode.

CRs-Fixed: 2200664
Change-Id: I9442b05b8c4d6213676943163e3c0b995047d903